mod_dav is the defacto means of implementing WebDAV support. Subversion does use libneon to provide WebDAV *services*. In Apache 2.0 mod_dav will be a standard module and the current mod_dav implementation will probably become stale. There is also HTTP::DAV.

My two issues with WebDAV is the slow implemantation of DeltaV (the V portion {Web Distributed Authoring and Versioning}) support/drafting. Along with mod_dav's insistence that the content it writes to be an exclusive repository, leading to complications with multi-user websites and shell editing.

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perl -pe "s/\b;([st])/'\1/mg"